Two-position mobile power saw



L. UNDERwooD Twol os1fr1oN MOBILE POWER sAw 2 sheets-sheet 1 IN VEN TOR.

[.90 Underwood BY W /f/or/ze/ mw. :SW

Feb. 14, 1950 Filed oct. 1, 1947 m m mm W, nv e N0 w m mw W 4 v mw a 2,t d l w n m ai 2 c m A0 m n m wm UJFIIJ mm ww mm A m w MTN. un I m. INNT Feb. 14, 1950 Flled Oct l 1947 Patented Feb. 14, 1950 UNITED STATESPATENT OFFICE TWO-POSITION MOBILE POWER SAW Leo Underwood, Bigelow',Ark.

Application OctoberL 194.7,I Serial No. 777,189

(ci. 14a-43 3; Glairns.y 1.

This invention relates to power-driven portable circular saws.

An object of this invention is to provide a simplified light-weight allpurpose portable saw which isoi rugged construction and adaptable foruse'in cutting underbrush, trees, stumps, clearing otright-oi-wayas wellas being capable oi trimmingl limbs from fallen trees, and cutting logsinto desired lengths for pulp wood or ties or the like. Also in generalconstruction work such as bridges where the saw is useful in trimmingtheY edges-of-bridgeiloors and cutting desired lengths of heavy` timber.

Another objectoi"thisinvention is to provide an improved portable powerdriven circular saw designed to be maneuvered on rough ground andinatheunderbrush where logging operations arel inprogress, so that thesaw may be easily positioned with respect to the logs to cut same atdesired points without the necessity of movingv thelogs toy level thesame.

Another object ofy this invention is to provide a. combination oi'features resulting in a twoposition mobile saw which is readilyportable, can be quickly set up in, position, minimizes labor inoperation and in which the saw can operate ineither vertical orhorizontal position.

With the above and other objects in View, the inventionv will beIhereinafter more particularly described, and the combination andarrangement ofparts will be shown in the accompanying drawings andpointed out in the claims whichform part of this specification.

Reference will now. be had to the drawings, wherein like numerals ofreference designate corresponding parts throughout the several views, inwhich: g

Figure 1 is atop plan view of the portable saw.

Figure 2 is a side elevation of the portable saw shown in Figure l, onerear wheel being partly broken away.y

Figure 3 is an enlarged cross-sectional viewl of a vertically adjustablepivotal lockable housing for a saw carrying frame, the section beingtaken as, on line 3--3 oiligure l.

Figure 4 is an enlarged cross-sectional View of the lockable housing,the section being taken as` online 4.-4 of Figure 3.

Figure 5, Sheet l, is a bottom plan view of a motor mounting, partlybroken away to show threadable adjustment means for the motor- Figure 6is an enlarged cross-sectional view of, an'adjustable clamp for the sawcarrying -rame thesection beingv taken as` on line 6--6 of Fig'- ural...i

Figuref'sisian enlarged cross-sectional view of amounting for the sawshaft, the section beingtakenas on line l--liof Figure-2.

FigureI 8is an `enlarged fragmentary perspective view of a channelsection'which carries the .i adjustable clamp for the saw carryingframe, the.-

channel being` shown as secured to a transverse member of the vehicleframe.

lggrure 9'tis a perspective view -of the bottom ofamotor plate.

Figure l0 is a cross-sectional View of the motor mounting showny inFigure 5, the-section beingV taken on line {El-IIJ:y off'Figure 5.

Figure ll is a cross-.sectionalviewof a twoposition housing, the sectionbeing taken as on line H-H ofFigure 1.

ln the illustrated embodiment ot the invention,- the numeral l!)indicates.v a two-wheeled vehicley comprising a substantiallyrectangular vehicle Theirame Il` includes parallel sidemembers t2 havingconverging diagonal braces |31 by. As shown in Figure 2, the axle i9issecured l to the frame l i-by U-shaped clamps 20'.

suitably secured to the transverse member:y I4

is'an, elevating device 2l comprising an uprightI guide-member 2 2having anupright guideway23. and h aying bearing Etrwhose axis isvertical atv its Vvupper end.

A.threadedcrankihandle 25.' is rotat ably-mount-v ed in the bearing 2liand is held against upward ordownward motion `by' collars 25 andtransverse pinsl. As shown in Figure 4,. it will be-noted thatzthecrank` '25, and hence also the bearing 24 f (thelatter does not appearin Fig. 4) are offsetv vfromthe guide member 22.

Aclamp arm i9` having a threaded aperture 30 is :pivotally mounted onthe threaded crank handle 25- and# may. be swungl horizontally towardthe'y Bolts 32 pass through the guide member 22. clamp harm 29 andthrough the guide member 2-2` and have threaded nuts 33 threadedthereon. A

plate 34 is mounted on the bolts 32 adjoining the inner face oi theguide `member 22.

The assembledpartsf 2S, 32 and 34 form averticallyslidable lockablehousing 35 designed tov receivethebody portion 36 ofa Tehanedsaw.-

Suitably connected to the2 3 frame 31. The body portion 35 is ofcircular cross-section and contacts the plate 34 and a plate portion 38at the free end of the clamp arm 29.

As best shown in Figs. 3 and 4, the bolts 32 support a threaded member40 in which a crank handle 4l having a bolt extension 42 is threaded.The extension 42 provides means for forcing the clamp arm 29 indirection of the clamp plate 34 to adjustably lock the saw frame 31 inselective angular cutting positions of the saw.

As shown in Figure 8, a channel-shaped member 45 is pivotally mounted ona rpivot 46 passing through the flanges bi1 of the channel and seatingin bearings 48 fixed to the transverse member I of the vehicle frame Il.

As shown in Figure 5, the channel 45 has slots 49 for an engine mount orplatform 5U on which an engine 5l is suitably mounted and secured bybolts 52 (Fig. 10) on the rear [part of the machine.

The rear end of the saw frame 31 is supported in a split 'collar orclamp 53 which is suitably iixed to the channel member 45. The collar 53has iianges 54, (Fig. 6) one of which is threaded .for engagement with athreaded portion of a crank handle 55.

It is to be noted that the body portion 36 of the saw rframe 31 Ihas acurve 39 which forms an offset front extension 35. This curve serves toalign the engine and saw pulleys while operating in either vertical orhorizontal positions.

At the termination of the extension 36 is a tubular housing 51 for ashaft 58, (Fig. 7) to one end of which a pulley 5S is secured. At theother end a large diameter circular saw 65 is secured.

It is to fbe noted that the housing 51 is suitably ifastened to theextension. 35 away from the middie of the housing so as to rform a shortleg 6l and a long leg 5E. The short leg 5I is of such reduced length tocause the saw lpulley 59 to bein alignment with a drive pulley 63 on theengine shaft 64.

Connecting the pulleys 5S and 63 is a V-shaped belt 65 which, in theposition shown in Figures l and 2, shows a partial twist. The degree ofthis twist is of course dependent upon the position of the plane of thesaw 50 relative to the vertical. This arrangement provides a direct beltdrive whereby the saw pulley 59 changes its height of operation whileretaining alignment with the drive pulley.

As shown in Figure 11, the free end of the body 36 of the saw lframe 31has two arcuately spaced V.shaped or countersunk apertures 55, spaced 9G,degrees apart, and that a pin 61 having a V-shaped end is pressed by acompression spring S8 to enter a selected one of these aperturesaccording to whether the saw is in vertical or horizontal position.

The apertures 65 and the coacting pin 51 provide releasable lockingmeans lwhereby the member 36 is locked in either the position shown inFig. l1, which corresponds to the position thereof in Figs, l and 2 withthe saw 55 horizontal, or, upon rotation of the member 36 through an arcof l90 degrees (clockwise, Fig. 11) in the position after said rotation,in which latter position the saw Si) would obviously lie in a verticalplane, not shown. A collar 69 is threaded on a tubular boss 1U on ahousing 1i xed to the channel 45. The collar 53 maintains the pin 51 andspring 68 in position. An operating handle 12 (Fig. 1) is. suitablysecured to the body portion 36 of the saw frame 31 and serves forrotating the saw frame when thecrank handles 4| and 55. are

4 actuated to loosen the clamp or lockable housing and the adjustableclamp 53 shown in Figure 6.

In practice, the saw BIJ may be operated at ground level or elevated toa height of about eighteen inches through the use of the verticallyadjustable housing shown in Figure 3 when in horizontal position.

While in vertical position, the saw may be elevated sufiiciently high totrim limbs of trees. At all times the saw may be changed from verticalto horizontal position without stopping the engine and without the beltlosing its normal tension. The saw revolves toward the operator, thusthrowing the sawdust in the opposite direction.

When the saw is operated as above described in horizontal position, whenthe housing 35 is raised, the saw is slanting. It is however possible bythe addition of an attachment (not shown) to the pivot shown in Figure8, to cause the rear end to rbe raised to provide level horizontaloperation at above-ground level.

As shown in Figures 1 and 2, the rear end of the channel has atransverse wall 13 having a clearance aperture in -which a rod extension14 of a crank handle 15 is freely rotatably mounted. The crank handle isheld against movement from the wall 13 by a collar 16. The free end ofthe rod 14 is threaded and engageable with a threaded lug 11 (Fig. 9) atone end of the enginemount 50.

The above threaded arrangement provides means permitting adjustmentwhereby the engine mount or platform may be moved back- Iward or forwardalong the channel 45 to adjust the belt for proper tension or for thepurpose of relieving the torque when starting the engine.

As shown in Figure 9, the engine platform 50 has parallel lugs 18spaced-apart for engagement with the flanges of the channel 45 whenmaking belt adjustments. The platform 50 has elongated tlucugh slots 19through which engine bolts pass for securing the engine 5I to theplatform 50.

It will thus be seen that there has been provided a portable circularsaw which can be manipulated like a wheellbarrow on ground contacting'wheels and approached at any angle to a fallen V74angularity of thefallen log with respect to the ground.

`ment of my invention, but it will be understood that various changesand modifications can be made therein without departing from the spiritof the invention as dened by the appended claims.

I claim:

1. rIn a portable circular saw comprising a vehicle having two wheelsand an axle supported thereby, a Vehicle frame supported on said axleintermediate said wheels, said frame converging .at the forward end ofsaid vehicle and terminating in a guide member having an uprightguideway, said guide member comprising a vertically rotatable threadedrod parallel with said guideway and rearward thereof, a pivotal clamparm threaded on said rod and movable in a horizontal plane to and fromsaid guide member, bolts passing through said clamp arm and through saidguideway and carrying a clamp plate parallel with said clamp arm, anelongated saw carrying frame having a circular body portion passingthrough and being rotatable in said housing, means for forcing saidclamp arm in the direction of said clamp plate to lock said saw frame invarious selective angular cutting positions of said saw, an engine onsaid vehicle body having a driving pulley, a driven pulley for said saw,and a belt connecting said pulleys and movable with said driven pulleyin all positions of said saw between horizontal and vertical positions.

2. In a portable circular saw comprising a vehicle having two wheels andan axle supported thereby, a vehicle frame supported on said axleintermediate said wheels, said frame converging at the forward end ofsaid vehicle and terminating in a guide member having an uprightguideway, said guide member comprising a vertically rotatable threadedrod parallel with said guideway and rearward thereof, a pivotal clamparm threaded on said rod and movable in a horizontal plane to and fromsaid guide member, bolts passing through said clamp arm and through saidguideway and carrying a clamp plate parallel with said clamp arm, aT-shaped saw frame having short and long legs, said frame having a shaftrotatably mounted in the leg portions thereof, a circular saw mounted onsaid shaft at the end of said long leg, said saw frame having a bodyportion receivable in said housing, said body portion being of circularcross-section to permit pivotal adjustment of said saw frame and saidsaw about said body portion between horizontal and vertical positionswhile supported by said housing, means for forcing said clamp arm in thedirection of said clamp plate to lock said saw frame in variousselective angular cutting positions of said saw, an engine on saidvehicle body having a. driving pulley, a driven pulley carried by saidshaft at the end of said short leg, and a belt connecting said pulleysand movable with said driven pulley in all positions of said saw betweenhorizontal and vertical positions.

3. In a portable circular saw comprising a vehicle having two wheels andan axle supported thereby, a vehicle frame supported on said axleintermediate said Wheels, said frame converging at the forward end ofsaid vehicle and terminating in a guide member having an upright guide-Way, said guide member comprising a vertically 6 rotatable threaded rodparallel with said guide- Way and rearward thereof, a pivotal clamp armthreaded on said rod and movable in a horizontal plane to and from saidguide member, bolts passing through said clamp arm and through saidguideway and carrying a clamp plate parallel with said clamp arm, aT-shaped saw frame having short and long legs, said frame having a shaftrotatably mounted in the leg portions thereof, a circular saw mounted onsaid shaft at the end of said long leg, said saw frame having a curvedor bent body portion and having an end portion receivable in saidhousing, said body portion being of circular cross-section to permitpivotal adjustment or said saw frame and said saw about said bodyportion between horizontal and vertical positions while supported bysaid housing, means for forcing said clamp arm in the direction of saidclamp plate to lock said saw frame in various selective angular cuttingpositions of said saw, an engine on said vehicle body having a drivingpulley, a, driven pulley carried by said shaft at the end of said shortleg, a belt connecting said pulleys and movable with said driven pulleyin all positions of said saw between horizontal and vertical positions,and means for tilting said T- shaped frame upwardly in angular relationrelative to said vehicle body, with the vertex of the angle positionedrearwardly of said lockable housing.

LEO UNDERWOOD.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,014,593 Guthrie Jan. 9, 19121,197,482 Harmon Sept. 5, 1916 1,447,606 Seymour Mar. 6, 1923 2,274,902Knight Mar. 3, 1942 2,407,028 McLean Sept. 3, 1946 2,455,369 KuykendallDec. 7, 1948 FOREIGN PATENTS Number Country Date 84,732 Switzerland Apr.16, 1920

